לאחר כל מייל שיוצא מתיבת הדואר שלי אני מקבל את ההודעה הרצ"ב:
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ATTENTION: Your e-mail was NOT delivered
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Your e-mail is being returned to you because there was a problem
with its delivery. The address which was undeliverable and the
reason is specified below.
Please direct further questions regarding this message to your
e-mail administrator.
— E-mail Postmaster
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Each of the following recipients was rejected by a remote mail server.
The reasons given by the server are included to help you determine why
each recipient was rejected.
While talking to 213.8.105.233:
Message not delivered, reply was: 554 5.1.0 Sender denied
בבדיקה שאני מבצע מול מכותבים שלי הם מאשרים את קבלת המייל ובכל זאת
למה אני מקבל הודעה זו